The published articles are meant to primarily educate the students in printing to supplement their knowledge in the field of Printing. These are not simple Glossary of printing terms, but to the extent possible every term has been explained in brief so that it can be of some use to the students who appear in some sort of examinations and interviews.
I served the Printing Industry for over 40 years
in various capacities, a major part in an Security Printing Organization. In order not to waste the printing and paper related knowledge which I gained over years, I decided to keep them in public domain for the reason stated in prepara. Most of the illustrations - over 90% - have been generated by me to explain the terms suitably.
While I am not sure to what extent the published content will help, if the content is going to be of use to some one in some manner, I will be greatly satisfied.
Your views may be sent to me (
nrj_1945@yahoo.com) for my record and correction wherever needed.

TOTAL NO OF PRINTING TERMS

POSTED TILL NOVEMBER, 2012

- Over 400 terms-

Click on this line to read from 'A'

Thursday, September 27, 2012

Alphabet -N


1. Nested : Keeping the Signature marks remain in hiding, the sections of the books are assembled in the proper sequence for binding is called Nesting. This is also called nested. The signature mark is a letter, number or combination of either or both, which is printed at the bottom of the first page of each section of the book. Since each book of several pages will have several sections it is to be ensured that the pages and sections are placed in the correct sequence order before binding. Therefore to help the binders gather the sections of the book in sequence an identification mark that tells the sequence like 1,2, 3, 4 or A, B, C, D etc are printed as signature mark, but at the same time the printed marks should not be visible after the books are bound, lest it will mar the appearance of the book and therefore they are nested. 
 
2. News Print : Paper made of mechanical pulp or wooden pulp. The Newsprint is a low quality paper meant for the paper used in printing newspapers and weeklies and monthlies with mass circulation besides telephone directories, comic books, trade magazines etc. This paper is considered to be low quality in terms of strength and durability and has shorter life span . They are manufactured mostly in off white color or slightly brownish due to the use of wood in the pulp. However good quality newsprint paper is manufactured by bleaching the pulp with certain chemicals in the paper making mills.
3. Newton Ring : This is one of the processing defects that occur in contact printing like making negatives, positives or photo prints. The image shows irregularly shaped patterns, something like bubble or oil spill on the surface of the water. This is due to improper contact where in some amount of air remains between two contacts. Newton rings arise when two smooth surfaces like glass and film are in position during contact. This problem also arises during scanning process. Due to invisible air bubble the light from the enlarger or the exposing lamps refracts into a rainbow pattern as it passes through the surface such as glass or film. This will leave bubble like appearance in the processed material. Waves reflecting from two surfaces can interfere constructively and destructively and such an interference will produce a concentric ring pattern. This defect will be visible only when a film negative or positive particularly that of an halftone image is transferred by contact or in a photo print which is made and developed from the negatives. Note that the defect will vary in content and size with each print from the same negatives as the air block can change position . if the glass is cleaned and worked the same defect may continue to occur if the film or the photo paper used and the glass frame are too shiny or smooth surfaced. If the defect continues to come in the processing department, they try to switch over to optically coated glass frames which of course will cost bit more. 
 
4. Nipping : In the book binding process, the folded sections are either sewed, stitched on sides or wire stitched. Since the folded edges of the sections will be bulgy at the back side (Spine) where the stitching takes place, it is necessary to remove the air from inside the sections that causes the bulge and make them lie flat. This is done by keeping the folded book ready for binding in hard-press and tightly press them giving hydraulic pressure to flatten the edges. Thus the process of destroying or knocking out the bulge of the back side of the book before sewing or stitching in binding is called Nipping which is a bindery term. Dictionary meaning of nipping is destroy. 
 
 

5. Neutral pH : The pH scale is from 0 – 14 . The scale below 7 is called acetic and above 7 are alkaline. Therefore the range of 7 is called neutral pH. The pH plays an important role in many areas of printing. The main material in printing, the paper is mostly manufactured with pH values in acetic range to increase the stability, facilitate ink absorbency, drying and to improve the permanency for printing of archival records. The pH also plays vital role in Offset printing process where emulsification of the ink takes place due to the dampener solution becoming acetic. Pure water is neutral, with a pH of 7.0. When chemicals are mixed with water, the mixture can become either acidic or basic. Chemicals that are highly acidic are called reactive chemicals and can cause burns. These chemicals can cause severe burns. pH is measured by either test strips or special apparatus available in the market.
 
6. Negative: A process photographic film that records the originals in reverse format i.e the black areas in the original remaining transparent and the white and bright areas in black. In short, the term negative denotes a photographic image that reproduces the bright portions of the photographed subject as dark and the dark parts as light areas. A transparent plastic film surface is coated with different chemicals and material like metallic silver that changes their properties in invisible manner when exposed to some light source. The invisible change that takes place is due to the reactions of light . When treated with another chemical the invisible changes will become visible to show the images in negative format. Different types of films are produced by different manufacturers to reproduce good negative processed in different manner. When the image from the negative is transferred on to a plate and printed, they reproduce the image as per the original format. In the photo lithography and printing processes where blocks are made, unless a film negatives is prepared the printing process can not continue. The negative is not a term to represent processing the black and white originals alone, even the colored originals are processed to produce negatives in black and white. When the photographic camera films are processed, the processed negatives will show colored images but in negative format. 
 
............Additions to alphabet N to be continued under N/2

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